From 98b0d724cf5b1c54512d453f88412ccdfb5bcc41 Mon Sep 17 00:00:00 2001
From: Shaun Reed <shaunrd0@gmail.com>
Date: Thu, 30 Apr 2020 23:40:35 -0400
Subject: [PATCH] Initial commit for doubly linked list

---
 plates/doublelist/Makefile       |  23 +++
 plates/doublelist/doublelist.cpp | 345 +++++++++++++++++++++++++++++++
 plates/doublelist/doublelist.h   |  54 +++++
 plates/doublelist/driver.cpp     | 106 ++++++++++
 4 files changed, 528 insertions(+)
 create mode 100644 plates/doublelist/Makefile
 create mode 100644 plates/doublelist/doublelist.cpp
 create mode 100644 plates/doublelist/doublelist.h
 create mode 100644 plates/doublelist/driver.cpp

diff --git a/plates/doublelist/Makefile b/plates/doublelist/Makefile
new file mode 100644
index 0000000..dde1fa7
--- /dev/null
+++ b/plates/doublelist/Makefile
@@ -0,0 +1,23 @@
+CXX=g++
+CXXFLAGS=-g -Wall
+
+###############################################################################
+# Driver
+###############################################################################
+
+driver:	driver.cpp	singlelist.o
+	${CXX} ${CXXFLAGS} driver.cpp singlelist.o -o driver
+
+###############################################################################
+# SingleList
+###############################################################################
+
+singlelist.o:	singlelist.cpp singlelist.h
+	${CXX} ${CXXFLAGS} -c singlelist.cpp -o singlelist.o
+
+###############################################################################
+# Clean
+###############################################################################
+
+clean:
+	rm -f *.o driver
diff --git a/plates/doublelist/doublelist.cpp b/plates/doublelist/doublelist.cpp
new file mode 100644
index 0000000..d4b2a75
--- /dev/null
+++ b/plates/doublelist/doublelist.cpp
@@ -0,0 +1,345 @@
+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
+## About: An example of a singly linked list                                 ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
+##############################################################################
+## singlelist.cpp
+*/
+
+#include "singlelist.h"
+
+/******************************************************************************
+ * Constructors, Destructors, Operators
+ *****************************************************************************/ 
+
+/** copy constructor
+ * @brief Construct a new SingleList::SingleList object from an existing one
+ * 
+ * @param rhs SingleList object
+ */
+SingleList::SingleList(const SingleList& rhs)
+{
+  Node *cp = rhs.head;
+  Node *tempHead;
+  if (cp == NULL) head = NULL;
+  else {
+    head = new Node(cp->data);
+    tempHead = head;
+    while (cp->next != NULL) {
+      cp = cp->next;
+      head->next = new Node(cp->data);
+      head = head->next;
+    }
+    head = tempHead;
+  }
+}
+
+/** operator=
+ * @brief Assign two SingleList objects equal using copy constr and class destr
+ *        Pass the rhs by value to create local copy, swap its contents
+ *        Destructor called on previous SingleList data at the end of this scope 
+ * 
+ * @param rhs SingleList object passed by value
+ * @return SingleList A deep copy of the rhs SingleList object
+ */
+SingleList SingleList::operator=(SingleList rhs)
+{
+  if (this == &rhs) return *this;
+  std::swap(head, rhs.head);
+  return *this;
+}
+
+/** destructor
+ * @brief Destroy the SingleList::SingleList object
+ */
+SingleList::~SingleList()
+{
+  makeEmpty();
+}
+
+/******************************************************************************
+ * Public Member Functions
+ *****************************************************************************/ 
+
+/** insert
+ * @brief Inserts a value to the head of our linked list
+ * 
+ * @param x The value to be inserted
+ */
+bool SingleList::insert(int val)
+{
+  bool inserted = insert(val, head);
+  if (inserted) 
+    std::cout << "[" << val << "] was inserted into the list\n";
+  else std::cout << "[" << val << "] could not be inserted into the list\n";
+  return inserted;
+}
+
+/** insert at
+ * @brief Inserts a value in the place of a given key
+ *        Key Node found is moved to the newNode->next positon
+ * 
+ * @param key The value to search for to determine insert location
+ * @param val The value to be inserted into the list
+ */
+bool SingleList::insert(int val, int key)
+{
+  bool inserted = insert(val, key, head);
+  if (inserted) 
+    std::cout << "[" << val << "] was inserted into the list\n";
+  else std::cout << "[" << val << "] could not be inserted into the list\n";
+  return inserted;
+}
+
+/** remove
+ * @brief Removes a value in the list by calling a private member and handling output
+ * 
+ * @param val Value to be removed from the list
+ * @return true If the value was removed from the list
+ * @return false If the value was not removed from the list
+ */
+bool SingleList::remove(int val)
+{
+  bool removed = remove(val, head);
+  if (removed) 
+    std::cout << "[" << val << "] was removed from the list\n";
+  else std::cout << "[" << val << "] could not be removed from the list\n";
+  return removed;
+}
+
+/** replace
+ * @brief Replaces a value in the list by calling a private member and handling output
+ * 
+ * @param val Value to insert into the list
+ * @param key Value to be replaced within the list
+ * @return true If the key has been replaced in the list by val
+ * @return false If the key has not been replaced in the list by val
+ */
+bool SingleList::replace(int val, int key)
+{
+  bool replaced = replace(val, key, head);
+  if (replaced) 
+    std::cout << "[" << key << "] was replaced by [" << val << "] in the list\n";
+  else std::cout << "[" << key << "] could not be replaced by [" << val << "] in the list\n";
+  return replaced;
+}
+
+/** makeEmpty
+ * @brief Empty this SingleList object, deleting all associated Nodes
+ */
+void SingleList::makeEmpty()
+{
+  Node *nextNode, *temp;
+
+  if (head == NULL) return;
+  nextNode = head->next;
+  delete head;
+  head = NULL;
+  while(nextNode != NULL) {
+    temp = nextNode;
+    nextNode = nextNode->next;
+    delete temp;
+    temp = NULL;
+  }
+}
+
+/** isEmpty
+ * @brief Determine if the SingleList is empty
+ * 
+ * @return true If the SingleList::head is NULL
+ * @return false If the SingleList::head contains data
+ */
+bool SingleList::isEmpty() const
+{
+  return head == NULL;
+}
+
+/** peek
+ * @brief returns the value at the SingleList::head
+ * 
+ * @return int The value held at the Node pointed to by SingleList::head
+ */
+void SingleList::peek() const
+{
+  if (!isEmpty()) 
+    std::cout << "[" << head->data << "] is at the top of our list\n";
+  else std::cout << "Nothing to peek, our list is empty...\n";
+}
+
+/** print
+ * @brief Output the data held by the SingleList object
+ *        Calls to the private print()
+ */
+void SingleList::print() const
+{
+  if(!isEmpty()) print(head);
+  else std::cout << "Nothing to print, our list is empty...\n";
+}
+
+/** find
+ * @brief Calls to the private member find() and handles return cases
+ * 
+ * @param val The value to search for within our SingleList
+ * @return true If the value was found in this SingleList
+ * @return false If the value was not found in this SingleList
+ */
+bool SingleList::find(int val) const
+{
+  Node *result = find(val, head);
+  if( result == NULL) {
+    std::cout << "[" << val << "] Was not found in our list\n";
+    return false;
+  }
+  
+  std::cout << "[" << result->data << "] Was found in our list\n";
+  return true;
+}
+
+/******************************************************************************
+ * Private Member Functions
+ *****************************************************************************/ 
+
+/** insert
+ * @brief Private member to handle inserting value into the list
+ * 
+ * @param val Value to be inserted
+ * @param head The head of the list to insert the value into
+ * @return true If the value was inserted
+ * @return false If the value could not be inserted
+ */
+bool SingleList::insert(int val, Node *&head)
+{
+  Node *newNode = new Node(val);
+  // If the list is not empty, update next pointer to head node
+  if (!isEmpty()) newNode->next = head;
+  // Always set head to our newNode
+  head = newNode; 
+  return true;
+}
+
+/** insert at
+ * @brief Private member to handle inserting a value at a key within our list
+ * 
+ * @param val Value to be inserted
+ * @param key Key value to search for within the list
+ * @param head Head node of the list to insert to
+ * @return true If the value was inserted
+ * @return false If the value was not inserted
+ */
+bool SingleList::insert(int val, int key, Node *&head)
+{
+  Node *newNode = new Node(val);
+  if (isEmpty()) return false;
+  // Let insert() handle inserting at the head
+  else if (head->data == key) return insert(val);
+
+  Node *keyNode = findPrevious(key, head);
+  // If there was no keyNode found, the key does is not in our list
+  // Don't insert anything, return false and let caller decide whats next
+  if (keyNode == NULL) return false;
+  // Set the newNode to come BEFORE our keyNode
+  newNode->next = keyNode->next;
+  keyNode->next = newNode;
+  return true;
+}
+
+/** remove
+ * @brief Private member to remove values from the list
+ * 
+ * @param val Value to be removed
+ * @param head Head of the list to remove the value from
+ * @return true If the value has been removed from the list
+ * @return false If the value has not been removed from the list
+ */
+bool SingleList::remove(int val, Node *&head)
+{
+
+  if (head == NULL) return false;
+  else if (head->data == val) {
+    head = head->next;
+    return true;
+  }
+
+  Node *prevNode = findPrevious(val, head);
+  if (prevNode == NULL) return false;
+  Node *gtfo = prevNode->next;
+  prevNode->next = prevNode->next->next;
+  delete gtfo;
+  return true;
+}
+
+/** replace
+ * @brief Private member to replace values within the list
+ * 
+ * @param val Value to insert into the list
+ * @param key Value to be replaced within the list
+ * @param head Head of the list to replace the value
+ * @return true If the key has been replaced by val within the list
+ * @return false If the key has not been replaced by val within the list
+ */
+bool SingleList::replace(int val, int key, Node *&head)
+{
+  Node *replacee = find(key, head);
+  if (replacee == NULL) return false;
+  replacee->data = val;
+  return true;
+}
+
+/** find
+ * @brief Find and return a Node which contains the given value
+ * 
+ * @param val The value to search for within our SingleList
+ * @return SingleList::Node* A pointer to the Node containing the search value
+ */
+SingleList::Node* SingleList::find(int val, Node *start) const
+{
+  // If given a NULL list, return NULL
+  // If given a head which contains the requested value, return the foundNode
+  if (start == NULL || start->data == val) return start;
+
+  Node *foundNode = start;
+  while (foundNode->next != NULL) {
+    foundNode = foundNode->next;
+    if (foundNode->data == val) return foundNode;
+  }
+  // If we have not yet returned a foundNode, the key is not in our list
+  return NULL;
+}
+
+/** findPrevious
+ * @brief Find and return the Node before a given value
+ * 
+ * @param val The value to search for within our SingleList
+ * @return SingleList::Node* A pointer to the Node previous to the  given value
+ */
+SingleList::Node* SingleList::findPrevious(int val, Node *start) const
+{
+  if (isEmpty()) return NULL;
+  else if (start->data == val) return start;
+
+  Node *temp = start;
+  while (temp->next != NULL) {
+    if (temp->next->data == val) return temp;
+    temp = temp->next;
+  }
+
+  return NULL;
+}
+
+/** print
+ * @brief Output the contents of a SingleList from the given Node to NULL
+ * 
+ * @param start The Node to begin traversing output from
+ */
+void SingleList::print(Node *start) const
+{
+  Node *temp = start;
+  std::cout << "List Contents: ";
+  while (temp != NULL) {
+    std::cout << temp->data << " | ";
+    temp = temp->next;
+  }
+  std::cout << std::endl;
+}
diff --git a/plates/doublelist/doublelist.h b/plates/doublelist/doublelist.h
new file mode 100644
index 0000000..24bcda2
--- /dev/null
+++ b/plates/doublelist/doublelist.h
@@ -0,0 +1,54 @@
+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
+## About: An example of a singly linked list                                 ##
+##                                                                           ##
+## Structure:   Remove:         Insert:      Insert at:   Replace:           ##
+## o-o-o-o-o-o  o-o--x-->o-o-o  o                o            o              ##
+##                              |               /|           / \             ##
+##                              o-o-o-o-o-o  o-o~o-o-o-o  o-o~x~o-o-o        ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
+##############################################################################
+## singlelist.h
+*/
+
+#ifndef LINKEDLIST_H
+#define LINKEDLIST_H
+
+#include <iostream>
+
+class SingleList{
+  public:
+    SingleList() : head(NULL) {};
+    SingleList(const SingleList& rhs);
+    SingleList operator=(SingleList rhs);
+    ~SingleList();
+    bool insert(int val);
+    bool insert(int val, int key);
+    bool remove(int val);
+    bool replace(int val, int key);
+    void makeEmpty();
+    bool isEmpty() const;
+    void peek() const;
+    void print() const;
+    bool find(int val) const;
+
+  private:
+    struct Node {
+      int data;
+      Node *next;
+      Node(): data(), next(NULL) {};
+      Node(int val): data(val), next(NULL) {};
+    };
+    Node *head;
+    bool insert(int val, Node *&head);
+    bool insert(int val, int key, Node *&head);
+    bool remove(int val, Node *&head);
+    bool replace(int val, int key, Node *&head);
+    Node* find(int val, Node *start) const;
+    Node* findPrevious(int val, Node *start) const;
+    void print(Node *start) const;
+};
+
+#endif
diff --git a/plates/doublelist/driver.cpp b/plates/doublelist/driver.cpp
new file mode 100644
index 0000000..be746e1
--- /dev/null
+++ b/plates/doublelist/driver.cpp
@@ -0,0 +1,106 @@
+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
+## About: A driver program to test a singly linked list                      ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
+##############################################################################
+## driver.cpp
+*/
+
+#include "singlelist.h"
+#include <iostream>
+
+enum OPS {
+  EXIT, INSERT, INSERTAT, EMPTY, PEEK, PRINT, FIND, REMOVE, REPLACE
+};
+
+int main()
+{
+  std::cout << "Driver: \n";
+
+  SingleList testList;
+  bool exit = false;
+  int choice = -1;
+  int val, key;
+
+  while (!exit)
+  {
+    std::cout << "##### Singly Linked List Menu #####\n\t0. Exit"
+      << "\n\t1. Insert\n\t2. Insert at\n\t3. Empty list\n\t4. Peek top of list"
+      << "\n\t5. Print list\n\t6. Find\n\t7. Remove\n\t8. Replace\n";
+    std::cin >> choice;
+    std::cin.clear();
+    switch (choice) {
+    case EXIT:
+      exit = true;
+      break;
+
+    case INSERT:
+      std::cout << "Enter a value to add to our list: ";
+      std::cin >> val;
+      std::cin.clear();
+      testList.insert(val);
+      break;
+
+    case INSERTAT:
+      std::cout << "Enter a new value to add to our list: ";
+      std::cin >> val;
+      std::cin.clear();
+      std::cout << "Enter an existing value to insert at within our list: ";
+      std::cin >> key;
+      std::cin.clear();
+      if (testList.insert(val, key)) {
+        std::cout << "List after inserting [" 
+          << val << "] at [" << key << "]: \n";
+        testList.print();
+      }
+      break;
+
+    case EMPTY:
+      testList.makeEmpty();
+      break;
+
+    case PEEK:
+      testList.peek();
+      break;
+
+    case PRINT:
+      testList.print();
+      break;
+
+    case FIND:
+      std::cout << "Enter an existing value to search for within our list: ";
+      std::cin >> val;
+      std::cin.clear();
+      testList.find(val);
+      break;
+
+    case REMOVE:
+      std::cout << "Enter an existing value to remove from our list: ";
+      std::cin >> val;
+      std::cin.clear();
+      testList.remove(val);
+      break;
+
+    case REPLACE:
+      std::cout << "Enter a new value to add to our list: ";
+      std::cin >> val;
+      std::cin.clear();
+      std::cout << "Enter an existing value to replace within our list: ";
+      std::cin >> key;
+      std::cin.clear();
+      if (testList.replace(val, key)) {
+        std::cout << "List after replacing [" 
+          << key << "] by [" << val << "]: \n";
+        testList.print();
+      }
+      break;
+
+    default:
+      std::cout << "Invalid entry...\n";
+      break;
+    }
+  }
+}
+